How to combine rows of data in SAS

I am trying to combine/collapse data to make it easier to run statistics on, but am having trouble on how to combine the data.

I was given billing data, and therefore patients can be billed multiple times for the same procedure using different billing codes.

I am trying to combine rows of data into a single row based on a patient's MRN and their date of surgery regardless of their billing codes (as I have recoded all the billing codes into bundles based on the procedure type).

i.e.

MRN DOB Date of Surgery Procedure Code

12345 1/1/11 July 1, 2017 12345

12345 1/1/11 July 1, 2017 12345

67890 2/2/22 July 2, 2017 12345

67890 2/2/22 July 3, 2017 23456

45678 3/3/33 July 4, 2017 567890

45678 3/3/33 July 4, 2017 567890

45678 3/3/33 July 4, 2017 567890

In the above example, I woul want it to be collapsed to the following: